Re: OSPF Authentication Methods - (3) [7:134182]

No only VUE written exams up to $350.00

I have to re-take the CCIE Written effective today actually.

:)

Darby

On Fri, May 20, 2011 at 9:35 AM, James Poplawski <jb.poplawski_at_gmail.com>wrote:

> They're offering lab vouchers?
>
> Sent from my iPhone
>
> On May 20, 2011, at 8:21 AM, Darby Weaver <darby.weaver_at_gmail.com> wrote:
>
> > Kewl - I've heard CCIE instructors state that since Null authentication
> is
> > not either Plain text or MD5, then it was not a method.
> >
> > Um.. That can be a killer and cost points due inability to interpret
> > especially when a candidate rules out the option as acceptable since a
> CCIE
> > instructor told them otherwise.
> >
> > Ouch!
> >
> > Nothing like being taught to fail... quite successfully.
> >
> > FYI - If you get a chance can you visit linkedin, join the group, and
> click
> > on the Like button to like my link please:
> >
> >
> >
> http://www.linkedin.com/groupAnswers?viewQuestionAndAnswers=&discussionID=54123549&gid=3443017&commentID=39652172&trk=view_disc
> >
> > I'm trying to win a free exam voucher.
> >
> >
> > Darby
> >
> > http://www.darbyslogs.blogspot.com
> >
> > On Fri, May 20, 2011 at 8:52 AM, manoj kaushal <kaushalpec_at_gmail.com>
> wrote:
> >
> >> I read about it in CCNP ROUTE book
> >>
> >> 1. NULL
> >> 2. Plain text
> >> 3. MD5
> >>
> >> On Fri, May 20, 2011 at 5:58 PM, Darby Weaver <darby.weaver_at_gmail.com
> >wrote:
> >>
> >>> That's what I love about the CCIE Lab...
> >>>
> >>> Everyone says there are "only" 2 types of authentication in OSPF....
> >>>
> >>> 1. Plain text
> >>> 2. MD5
> >>>
> >>> If you listen to all your most knowledgeable friends on Groupstudy and
> a
> >>> couple of three (maybe more CCIE's of some repute)...
> >>>
> >>> And then you find yourself in the "gladiator's chamber" one day... and
> a
> >>> third is suggested by some hint of a vague clue...
> >>>
> >>> Unless you've heard of RFC2328 and then you find... there is a third...
> >>> and
> >>> you find yourself astonished in about the same way everyone else was
> when
> >>> we
> >>> found out that Luke Skywalker was not quite "The Last Hope" as
> mentioned
> >>> by
> >>> Yoda... Yep... there are three...
> >>>
> >>>
> >>> OSPF as defined in
> >>> [RFC2328]
> >>> includes three different types of
> >>> authentication schemes: Null authentication, simple password and
> >>> cryptographic authentication. NULL authentication is akin to having
> >>> no authentication at all. In the simple password scheme of
> >>> authentication, the passwords are exchanged in the clear text on the
> >>> network and anyone with physical access to the network can learn the
> >>> password and compromise the security of the OSPF domain.
> >>>
> >>> In the cryptographic authentication scheme, the OSPF routers on a
> >>> common network/subnet share a secret key which is used to generate a
> >>> keyed MD5 digest for each packet and a monotonically increasing
> >>> sequence number scheme is used to prevent replay attacks.
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>> Darby Weaver
> >>> Network Engineer
> >>> http://www.darbyslogs.blogspot.com
> >>>
> >>> darbyweaver_at_yahoo.com
> >> --
> >> Kaushal
> >>
> >>
> >
> >
> > --
> > Darby Weaver
> > Network Engineer
> > http://www.darbyslogs.blogspot.com
> >
> > darbyweaver_at_yahoo.com
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> >
> >
> >
> >
> >
>

-- 
Darby Weaver
Network Engineer
http://www.darbyslogs.blogspot.com
darbyweaver_at_yahoo.com
Blogs and organic groups at http://www.ccie.net